Current & Voltage Relationship

In this section 2.2:
U must be able to analyse the relation between current & Potential difference or sometimes known as voltage. By understanding the concept, we then can deduce a law called Ohm's law. The experiment that derives ohm's law is so important..please study& understand it properly..it quite famous in exam.,.

Here i give u list of important things that might be asked in exam

1. Define potential difference??
refer to your text/ reference book..then try to watch this

So basically,voltage is a work done per unit charge.

2.U must also be able to Plan & conduct an experiment to find the relationship between current & potential difference(voltage).

From this experiment u shud be getting a straight line graph of Voltage(V) vs Current (I). This experiment can come out in paper3 or paper2.
I want to remind u again, please make sure you know how to design this experiment.

3.Next, u must know
What is the relationship between current & potential diffrence (voltage)??
Voltage(V) is directly proportional with current (I). So if current(I) increases, voltage(V) also increases.

V α I

4. Then.. a must for u to know how to...
..State OHm's Law:
Current flowing through a conductor is directly proportional to potential diffrence at constant temperature.

Ohmic conductor obeys ohms law, i.e the graph of V vs I will be a staight line.
Non ohmic conductor wont give a straight line graph.

5. After that..u must be able to define RESISTANCE.
Resistance = ratio of voltage over current
i.e by formula R= V/I. the unit is ohm or Ω.

Watch this video to get a clear picture about all the relationship between V,I & R ...

Ohms Law